IE浏览器COM自动化：如何获得window.execScript`的`在PowerShell中的返回值 [英] IE COM automation: How to get the return value of `window.execScript` in PowerShell

问题描述

其他帖子它看起来可能获得 IHTMLWindow2的返回值:: EXECSCRIPT 从Internet Explorer API，但链接的例子是在C ++和我真的不明白。我试图做同样的事情在的PowerShell ，所以这里是我的code，显示问题：

From this other post it looks like it is possible to get the return value of IHTMLWindow2::execScript from Internet Explorer API, however the linked example is in C++ and I don't really understand it. I'm trying to do the same thing in PowerShell, so here's my code that shows the problem:

$ie = New-Object -COM InternetExplorer.Application
$ie.visible = $true
$ie.navigate("http://google.com")
while ( $ie.busy ) { start-sleep -m 100 }
$document = $ie.document
$window = $document.parentWindow

Function eval($jsCommand) {
    # Of course it doesn't return anything here. How can I get the return value?
    return $window.execScript($jsCommand, 'javascript')
}

eval 'parseInt("12")' # returns nothing

我真正要做的是让我的PowerShell脚本可用jQuery选择/对象，这样我可以做这样的事情：

What I'm really trying to do is to make jQuery selector/objects available in my PowerShell script, so that I can do things like:

eval '$("input#selector")' | where name -eq 'username'

和其他。

更新：看看这个要点 PowerShell的功能运行的JavaScript / jQuery和结果返回PS，与超时。它是从下面的答案扩展。

Update: Look at this Gist for PowerShell function to run JavaScript/JQuery and return results back to PS, with timeout. It was extended from the answer below.

推荐答案

在preferred方法可能就是@马特建议使用的评估方法代替的 EXECSCRIPT 以来一直在IE11 pcated德$ p $。不过，我还是没找到如何访问评估从IE浏览器的API。我创造了这个其他问题与跟进。

The preferred method is probably what @Matt suggested to use the eval method instead of execScript which has been deprecated in IE11. However, I still couldn't find how to access that eval from IE API. I created this other question to follow up with that.

我可以，但是，图的方式在网页上执行JavaScript / jQuery的，结果这个把戏，我们存储使用DOM中的JavaScript的返回值返回到PowerShell的的setAttribute ，然后检索它在PowerShell中的getAttribute 。

I could, however, figure a way to execute JavaScript/jQuery on a web page and return the results back to PowerShell with this trick that we store the JavaScript return value in the DOM using setAttribute and then retrieving it in PowerShell using getAttribute.

# some web page with jQuery in it
$url = "http://jquery.com/"

# Use this function to run JavaScript on a web page. Your $jsCommand can
# return a value which will be returned by this function unless $global
# switch is specified in which case $jsCommand will be executed in global
# scope and cannot return a value. If you received error 80020101 it means
# you need to fix your JavaScript code.
Function ExecJavaScript($ie, $jsCommand, [switch]$global)
{
    if (!$global) {
        $jsCommand = "document.body.setAttribute('PSResult', (function(){$jsCommand})());"
    }
    $document = $ie.document
    $window = $document.parentWindow
    $window.execScript($jsCommand, 'javascript') | Out-Null
    if (!$global) {
        return $document.body.getAttribute('PSResult')
    }
}

Function CheckJQueryExists
{
    $result = ExecJavaScript $ie 'return window.hasOwnProperty("$");'
    return ($result -eq $true)
}

$ie = New-Object -COM InternetExplorer.Application -Property @{
    Navigate = $url
    Visible = $false
}
do { Start-Sleep -m 100 } while ( $ie.ReadyState -ne 4 )

$jQueryExists = CheckJQueryExists $ie
echo "jQuery exists? $jQueryExists"

# make a jQuery call
ExecJavaScript $ie @'
    // this is JS code, remember to use semicolons
    var content = $('#home-content');
    return content.text();
'@

# Quit and dispose IE COM
$ie.Quit()
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($ie) | out-null
Remove-Variable ie

这篇关于IE浏览器COM自动化：如何获得window.execScript`的`在PowerShell中的返回值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！